Rediff.com India — My Rediffmail account hacked- urgent

Website:

Rediffmail.india

Hi, my account rediffmail.com which I have been using under the name [protected]@ rediffmail.com has been hacked.
All my important emails related to company has been in that email.the hacker has changed everything from recovery phone number and alternate email id too
My social media accounts has also been linked to this account.It really worries me as it contains photos and important details.
Don't know what hacker wil up to with my details..
Kindly solve my problem and my alternate email is [protected]@gmail.com.kindly contact me